Possibly Pregnant

Has anyone ever had what seemed like a period and still been pregnant. My cycle started 10/08/2017 after being 3 days late. I’ve never had a cycle past 27 days since I started having periods. Anywho my flow is super light almost to the point where it’s like spotting. I haven’t filled a single pad ( and I’ve been using lite flow ones). My cycle appears to be ending as it’s just brown spotting here and there after just a little over a day my cycle is usually 5 days.